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Open the jaws of the vice so the metal shell of the magsafe just fits between them. Place the magsafe between the jaws with the cable upwards and the white plastic housing resting on the jaws.

Cut off the cable as close to the housing as possible.

Use a cross-head screwdriver to force the metal section of the magsafe out of the plastic housing

Gently prise apart the strain relief metal band around the remains of the cable and put it aside for later.

Cut down one side of the soft plastic inner and peel it away from the wires and circuit board. You are very unlikely to be able to re-use it so don't worry if it tears.

The image shows roughly what you should now have. The braid is soldered to two places (one on each site of the circuit board at opposite ends - middle and right in the picture); the white core is soldered in just one (left in the picture).

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You will probably want three strips of heatshrink. They will need to fit over each other shrunk in place so likely need to be different sizes.

Cut the smallest diameter sleeve to 2cm long. Once shrunk into place the white plastic outer will need to fit over this. You might wish to check that this will work, as otherwise you will need to enlarge the hole in the housing (now, not later!).

Cut the others a little longer each e.g. 2.5cm and 3cm.

Slide the largest diameter heatshrink over the cable.

Slide on the next largest size

Push the remains of the strain relief out of the white plastic outer housing. Now slide on the plastic outer part of the magsafe connector. Make sure that you get it the right way round!

I do believe they are glued. Opening the cable management tabs (not sure what they're actually called) we'll give you access and room to attempt to pretty it apart. There are videos on YouTube, and most likely a tutorial here on iFixit.